| CPC H04W 72/23 (2023.01) [H04L 1/1812 (2013.01); H04W 72/1268 (2013.01)] | 16 Claims |

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1. A method of performing communication in a wireless communication system by a user equipment (UE), the method comprising:
receiving uplink (UL) grant configuration information via a radio resource control (RRC) release message;
selecting a synchronization signal block (SSB) among at least one SSB identified based on the UL grant configuration information;
identifying a UL grant corresponding to the selected SSB;
identifying a hybrid automatic repeat request (HARQ) process corresponding to the identified UL grant based on the UL grant configuration information; and
transmitting a UL medium access control protocol data unit (MAC PDU) based on the identified UL grant using the identified HARQ process in an RRC INACTIVE state.
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